Skip to content
AquaCensus

Ottawa County, Ohio — public water systems

At a glance

36 active public water systems are filed under Ottawa County, Ohio in EPA's SDWIS records, together reporting 47,393 people served. The largest is Ottawa County Regional Water District, which reports serving 20,428 people. 11 are community water systems serving people where they live; the other 25 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.

Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

36

Population served

47.4K

Community systems

11

Groundwater share

75%

How does Ottawa County compare with other Ohio counties?

Ottawa County has the 38th-most active public water systems among the 133 counties listed for active Ohio systems in EPA records; among the 92 with 3 or more systems, the median has 29. Its systems report 47,393 people served in total, the 44th-largest county figure in the state and 0.4% of the statewide total. The average system here reports serving 1,317 people, about half of the Ohio average of 2,767. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.

Where does Ottawa County's drinking water come from?

By primary water source, Ottawa County's active systems draw on groundwater (27, 75%), purchased surface water (5, 14%) and surface water (4, 11%). Overall, 75% rely mainly on groundwater (including purchased groundwater) and 25% on surface water, compared with 92% and 7.6% across Ohio. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Ottawa County Regional Water District, draws primarily on surface water.

What kinds of water systems operate in Ottawa County?

Ottawa County's active systems break down as 11 community systems (31%), 2 non-transient non-community systems (5.6%) and 23 transient non-community systems (64%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (78%) and local government (22%).

Water systems in Ottawa County

🔒 Create a free account to export CSV
Active public water systems in Ottawa County, Ohio
#Water systemCountyPopulation servedTypeSource
1Ottawa County Regional Water DistrictOttawa20,428CommunitySurface water
2Port Clinton CityOttawa6,500CommunityPurchased surface water
3Put-in-Bay VillageOttawa5,000CommunitySurface water
4Oak Harbor VillageOttawa4,400CommunityPurchased surface water
5Genoa VillageOttawa3,110CommunityPurchased surface water
6Carroll Water and SewerOttawa2,288CommunitySurface water
7Elmore VillageOttawa1,421CommunityPurchased surface water
8Marblehead VillageOttawa865CommunityPurchased surface water
9Cedarlane Rv ParkOttawa600Transient non-communityGroundwater
10Lake Erie Utilities CompanyOttawa400Transient non-communitySurface water
11St Hazards - Middle Bass IslandOttawa300Transient non-communityGroundwater
12J F WalleyeOttawa207Transient non-communityGroundwater
13Blackberry CornersOttawa150Transient non-communityGroundwater
14Chippewa Golf ClubOttawa150Transient non-communityGroundwater
15Grand CountryOttawa130CommunityGroundwater
16The KegOttawa115Transient non-communityGroundwater
17Catawba Shores M H CourtOttawa102Transient non-communityGroundwater
18Crazy Lady SaloonOttawa100Transient non-communityGroundwater
19Bethel United Brethren Church - ElmoreOttawa100Transient non-communityGroundwater
20St Peters Lutheran Church/PreschoolOttawa89Transient non-communityGroundwater
21Green Valley Mobile Home ParkOttawa82CommunityGroundwater
22Grace Lutheran Church ElmoreOttawa81Transient non-communityGroundwater
23Sugar Creek Golf ClubOttawa78Transient non-communityGroundwater
24Greenwood Mobile Home ParkOttawa77CommunityGroundwater
25Shade Acres Campground and Rv ParkOttawa75Transient non-communityGroundwater
26Ernestos RestaurantOttawa71Transient non-communityGroundwater
27St John Lutheran Church - Rocky RidgeOttawa60Transient non-communityGroundwater
28North Point Education Service Ctr OttawaOttawa60Non-transient non-communityGroundwater
29Graymont Dolime (Oh)Ottawa60Non-transient non-communityGroundwater
30Kaisers Limestone TavernOttawa54Transient non-communityGroundwater
31The Mockingbird on Mill RoadOttawa53Transient non-communityGroundwater
32Hidden Hideaway Campground West-RearOttawa50Transient non-communityGroundwater
33Bench, Robert Amlc PwsOttawa42Transient non-communityGroundwater
34Elliston Zion Umc- GraytownOttawa40Transient non-communityGroundwater
35Hidden Hideaway Campground East-FrontOttawa30Transient non-communityGroundwater
36Bench-Dickinson Amlc PwsOttawa25Transient non-communityGroundwater

Ottawa County water systems: frequently asked questions

How many public water systems are in Ottawa County, Ohio?

EPA's SDWIS records file 36 active public water systems under Ottawa County, Ohio: 11 community systems (31%), 2 non-transient non-community systems (5.6%) and 23 transient non-community systems (64%).

Who supplies drinking water in Ottawa County, OH?

The largest community water systems filed under Ottawa County are Ottawa County Regional Water District (20,428 people served), Port Clinton City (6,500 people served) and Put-in-Bay Village (5,000 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.

Does Ottawa County's drinking water come from groundwater or surface water?

Of the 36 active public water systems in Ottawa County, 75% draw mainly on groundwater and 25% on surface water, counting purchased supplies. The largest system, Ottawa County Regional Water District, uses surface water.

Where can I find a water quality report for Ottawa County?

Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 11 community systems are filed under Ottawa County, so the report to look for is the one from the system that supplies your address.

How can I check violations for a water system in Ottawa County?

Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.

More Ohio water systems

About this data

Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.

Cite as: AquaCensus, “Public water systems in Ottawa County, Ohio”, https://aquacensus.com/water-systems/ohio/ottawa (data as of October 1, 2026).